Cov qauv hlau ntawm lub qhov rooj hluav taws steel tuaj yeem ua kom ntseeg tau tias nws tsis yooj yim rau kev puas tsuaj los ntawm kev cuam tshuam deformation thiab sab nraud quab yuam, thiab tuaj yeem siv tau ntev ntev yam tsis muaj kev hloov.

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